AU4629999A - Current loop comprising a test circuit - Google Patents

Current loop comprising a test circuit

Info

Publication number
AU4629999A
AU4629999A AU46299/99A AU4629999A AU4629999A AU 4629999 A AU4629999 A AU 4629999A AU 46299/99 A AU46299/99 A AU 46299/99A AU 4629999 A AU4629999 A AU 4629999A AU 4629999 A AU4629999 A AU 4629999A
Authority
AU
Australia
Prior art keywords
current
acquisition
loop
sensor
acquisition system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
AU46299/99A
Inventor
Jean-Paul Audren
Jean Marmonier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alstom Holdings SA
Original Assignee
Alstom France SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alstom France SA filed Critical Alstom France SA
Publication of AU4629999A publication Critical patent/AU4629999A/en
Abandoned legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage

Landscapes

  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Semiconductor Integrated Circuits (AREA)
  • Printing Elements For Providing Electric Connections Between Printed Circuits (AREA)
  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
  • Structure Of Printed Boards (AREA)

Abstract

The 4 mA-20 mA type or 0-20 mA type current loop connects an analog sensor (1) to an acquisition system (3), respectively carrying a sensor current (Ic) and an acquisition current (Ia). A test circuit is connected in parallel with the current loop to inject a superposition current (Is) into said loop, which current is superposed on the sensor current (Ic) or on the acquisition current (Ia). In a first embodiment, a variable voltage generator (7) injects the superposition current (Is) by adding it to the acquisition current (Ia), thereby making it possible to check a low-current threshold of the acquisition system (3). In a second embodiment, a variable current regulator injects the superposition current (Is) by adding it to the sensor current (Ic), thereby making it possible to check a high-current threshold of the acquisition system. The high- and low-current thresholds of the acquisition system are tested without opening the current loop.
AU46299/99A 1998-07-20 1999-07-19 Current loop comprising a test circuit Abandoned AU4629999A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9809217 1998-07-20
FR9809217A FR2781301B1 (en) 1998-07-20 1998-07-20 CURRENT LOOP OF THE TYPE 4-20 MILLIAMPERES OR 0-20 MILLIAMPERES COMPRISING A TEST CIRCUIT IN PARALLEL
PCT/FR1999/001764 WO2000005695A1 (en) 1998-07-20 1999-07-19 Current loop comprising a test circuit

Publications (1)

Publication Number Publication Date
AU4629999A true AU4629999A (en) 2000-02-14

Family

ID=9528776

Family Applications (1)

Application Number Title Priority Date Filing Date
AU46299/99A Abandoned AU4629999A (en) 1998-07-20 1999-07-19 Current loop comprising a test circuit

Country Status (15)

Country Link
US (1) US6337570B1 (en)
EP (1) EP1036385B1 (en)
KR (1) KR20010024158A (en)
CN (1) CN1118784C (en)
AT (1) ATE397262T1 (en)
AU (1) AU4629999A (en)
BR (1) BR9906610A (en)
CA (1) CA2303980A1 (en)
DE (1) DE69938816D1 (en)
FR (1) FR2781301B1 (en)
ID (1) ID24131A (en)
NZ (1) NZ503395A (en)
TR (1) TR200000658T1 (en)
TW (1) TW510973B (en)
WO (1) WO2000005695A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7118273B1 (en) 2003-04-10 2006-10-10 Transmeta Corporation System for on-chip temperature measurement in integrated circuits
US7683796B2 (en) * 2006-10-04 2010-03-23 Honeywell International Inc. Open wire detection system and method
CN100529773C (en) * 2006-11-10 2009-08-19 群康科技(深圳)有限公司 Integrate circuit system pressing impedance detection method
DE102006058925A1 (en) * 2006-12-12 2008-06-19 Endress + Hauser Gmbh + Co. Kg Device for determining and / or monitoring a process variable
US9362071B2 (en) 2011-03-02 2016-06-07 Franklin Fueling Systems, Inc. Gas density monitoring system
IN2014DN07676A (en) 2012-02-20 2015-05-15 Franklin Fueling Systems Inc
CN111814302B (en) * 2020-05-28 2024-03-08 嘉兴市恒光电力建设有限责任公司 Transformer insulating oil temperature acquisition transmission loop fault removal system and method
US11315453B1 (en) * 2020-11-08 2022-04-26 Innolux Corporation Tiled display device with a test circuit

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3829886A (en) * 1973-05-21 1974-08-13 Sperry Rand Corp Bistable semiconductor temperature sensor
US4213180A (en) * 1978-06-22 1980-07-15 The Bendix Corporation Closed loop sensor condition detector
US4633217A (en) * 1984-06-04 1986-12-30 Yamatake Honeywell Communication apparatus
US4634981A (en) * 1984-10-19 1987-01-06 Westinghouse Electric Corp. Method for testing a circuit breaker using a three terminal current transformer
US4607247A (en) * 1985-08-12 1986-08-19 The Babcock & Wilcox Company On-line serial communication interface from a transmitter to a current loop
JP2735174B2 (en) * 1985-10-16 1998-04-02 株式会社日立製作所 2-wire communication method
JP2580343B2 (en) * 1989-10-13 1997-02-12 株式会社日立製作所 Field instrument system and communicator
US5471144A (en) * 1993-09-27 1995-11-28 Square D Company System for monitoring the insulation quality of step graded insulated high voltage apparatus
US5402040A (en) * 1993-11-23 1995-03-28 The Watt Stopper Dimmable ballast control circuit
US5563587A (en) * 1994-03-21 1996-10-08 Rosemount Inc. Current cancellation circuit
US5574378A (en) * 1994-12-15 1996-11-12 Square D Company Insulation monitoring system for insulated high voltage apparatus
DE59510114D1 (en) * 1995-02-17 2002-04-25 Siemens Metering Ag Zug Arrangement for temperature compensation
US5805062A (en) * 1996-10-21 1998-09-08 Mini-Systems, Inc. 2-wire optovoltaic loop-powered isolation amplifier with current bootstrapping
US6102340A (en) * 1997-02-07 2000-08-15 Ge-Harris Railway Electronics, Llc Broken rail detection system and method
US6104791A (en) * 1998-06-11 2000-08-15 Conexant Systems, Inc. System and method for performing telephone line-in-use detection, extension pick-up detection, and remote hang-up detection in a modem

Also Published As

Publication number Publication date
CN1118784C (en) 2003-08-20
TW510973B (en) 2002-11-21
CN1274452A (en) 2000-11-22
ATE397262T1 (en) 2008-06-15
BR9906610A (en) 2000-09-19
ID24131A (en) 2000-07-06
DE69938816D1 (en) 2008-07-10
TR200000658T1 (en) 2000-11-21
CA2303980A1 (en) 2000-02-03
WO2000005695A1 (en) 2000-02-03
US6337570B1 (en) 2002-01-08
KR20010024158A (en) 2001-03-26
FR2781301B1 (en) 2000-09-08
EP1036385A1 (en) 2000-09-20
NZ503395A (en) 2001-04-27
EP1036385B1 (en) 2008-05-28
FR2781301A1 (en) 2000-01-21

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Legal Events

Date Code Title Description
MK6 Application lapsed section 142(2)(f)/reg. 8.3(3) - pct applic. not entering national phase